flutter charts just like MPAndroidChart

The minimum version currently supported is 1.7.3. If you use flutter with lower version, checkout and use 'localPosition-support' branch, this branch support for flutter version which XXXDetails and PointerXXXEvent not support wiget local postion

Thanks for MPAndroidChart, when translate this library to flutter I learned a lot about matrix use in animation.

1.potential bugs fix

LineCharts

BarCharts

PieCharts

OtherCharts

ScrollingCharts

EvenMoreCharts

Copyright 2019 SunPointed

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

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